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metal deck fasteners

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发表于 2009-9-10 13:39:55 | 显示全部楼层 |阅读模式
metal deck fasteners
does anyone know if there is a structural issue with button punching metal deck at the side laps?  i had heard that it is not preferred (vs screws or welding) and decreases the integrity of the deck. any comments appreciated.  thanks.
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if i recall correctly, the button punching method had the lowest of the diaphragm shear values for sidelap connections. they did not seem substantial as a welded or screwed nested connection. they have been dropped from the recent diaphragm tables. i assume that deck manufacturers no longer make the upstanding seam for button punching.
the newest deck information that i have is from vulcraft.  they do not provide any diaphragm values for button punched sidelaps.  what they do provide is diaphragm values for 0 sidelap fasteners that are shaded (at over 5'6" joist spacing).  the footnote for the shaded area is as follows: "the shaded values do not comply with the minimum spacing requirements for sidelap connections and shall not be used except with properly spaced button punched sidelaps with 1.5bi deck."
i don't use button punched laps for bare deck diaphragms (non-composite deck), though it may be allowed at lower diaphragm shear capacities.  in composite decks, i use button punched laps and use the concrete above deck for diaphragm capacity which is typically higher than bare deck with heavier lap attachment.
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